[release-1.11] Autoscaler considers reserved and pending replicas

[knative-prow-robot]

This is an automated cherry-pick of #7027

[codecov]

Codecov Report

Patch coverage: 51.12% and project coverage change: -0.22% ⚠️

Comparison is base (3ccfc1c) 77.95% compared to head (8715eb9) 77.74%.

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.11    #7216      +/-   ##
================================================
- Coverage         77.95%   77.74%   -0.22%     
================================================
  Files               250      250              
  Lines             13419    13506      +87     
================================================
+ Hits              10461    10500      +39     
- Misses             2422     2470      +48     
  Partials            536      536              

Files Changed	Coverage Δ
pkg/scheduler/statefulset/scheduler.go	72.43% <10.81%> (-4.84%)	⬇️
pkg/scheduler/state/state.go	82.31% <65.71%> (-2.22%)	⬇️
pkg/scheduler/statefulset/autoscaler.go	76.99% <67.21%> (-0.66%)	⬇️

... and 1 file with indirect coverage changes

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[matzew]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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[pierDipi]

/test upgrade-tests